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https://github.com/jart/cosmopolitan.git
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Add IPv6 support to getifaddrs() on Linux (#1415)
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This commit is contained in:
Hugues Morisset
GitHub
parent
2fe8338f92
commit
f1e83d5240
3 changed files with 256 additions and 33 deletions
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@ -18,13 +18,19 @@
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/sock/ifaddrs.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/limits.h"
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#include "libc/mem/mem.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/ifconf.h"
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#include "libc/sock/struct/ifreq.h"
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#include "libc/sock/struct/sockaddr6.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/consts/iff.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/sio.h"
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#include "libc/sysv/consts/sock.h"
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@ -36,6 +42,20 @@ struct IfAddr {
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struct sockaddr_in bstaddr;
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};
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struct IfAddr6Info {
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int addr_scope;
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int addr_flags;
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};
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struct IfAddr6 {
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struct ifaddrs ifaddrs;
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char name[IFNAMSIZ];
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struct sockaddr_in6 addr;
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struct sockaddr_in6 netmask;
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struct sockaddr_in6 bstaddr; // unused
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struct IfAddr6Info info;
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};
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/**
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* Frees network interface address list.
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*/
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@ -48,6 +68,73 @@ void freeifaddrs(struct ifaddrs *ifp) {
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}
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}
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// hex repr to network order int
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static uint128_t hex2no(const char *str) {
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uint128_t res = 0;
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const int max_quads = sizeof(uint128_t) * 2;
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int i = 0;
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while ((i < max_quads) && str[i]) {
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uint8_t acc = (((str[i] & 0xF) + (str[i] >> 6)) | ((str[i] >> 3) & 0x8));
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acc = acc << 4;
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i += 1;
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if (str[i]) {
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acc = acc | (((str[i] & 0xF) + (str[i] >> 6)) | ((str[i] >> 3) & 0x8));
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i += 1;
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}
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res = (res >> 8) | (((uint128_t)acc) << ((sizeof(uint128_t) - 1) * 8));
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}
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res = res >> ((max_quads - i) * 4);
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return res;
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}
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/**
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* Gets network interface IPv6 address list on linux.
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*
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* @return 0 on success, or -1 w/ errno
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*/
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static int getifaddrs_linux_ip6(struct ifconf *conf) {
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int fd;
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int n = 0;
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struct ifreq *ifreq = conf->ifc_req;
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const int bufsz = 44 + IFNAMSIZ + 1;
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char buf[bufsz + 1]; // one line max size
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if ((fd = sys_openat(0, "/proc/net/if_inet6", O_RDONLY, 0)) == -1) {
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return -1;
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}
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while ((n = sys_read(fd, &buf[n], bufsz - n)) &&
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((char *)ifreq < (conf->ifc_buf + conf->ifc_len))) {
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// flags linux include/uapi/linux/if_addr.h:44
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// scope linux include/net/ipv6.h:L99
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// *addr, *index, *plen, *scope, *flags, *ifname
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char *s[] = {&buf[0], &buf[33], &buf[36], &buf[39], &buf[42], &buf[45]};
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int ifnamelen = 0;
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while (*s[5] == ' ') {
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++s[5];
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}
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while (s[5][ifnamelen] > '\n') {
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++ifnamelen;
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}
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buf[32] = buf[35] = buf[38] = buf[41] = buf[44] = s[5][ifnamelen] = '\0';
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bzero(ifreq, sizeof(*ifreq));
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ifreq->ifr_addr.sa_family = AF_INET6;
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memcpy(&ifreq->ifr_name, s[5], ifnamelen);
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*((uint128_t *)&ifreq->ifr6_addr) = hex2no(s[0]);
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ifreq->ifr6_ifindex = hex2no(s[1]);
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ifreq->ifr6_prefixlen = hex2no(s[2]);
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ifreq->ifr6_scope = hex2no(s[3]);
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ifreq->ifr6_flags = hex2no(s[4]);
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++ifreq;
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int tlen = &s[5][ifnamelen] - &buf[0] + 1;
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n = bufsz - tlen;
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memcpy(&buf, &buf[tlen], n);
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}
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conf->ifc_len = (char *)ifreq - conf->ifc_buf;
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return sys_close(fd);
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}
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/**
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* Gets network interface address list.
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*
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@ -55,6 +142,7 @@ void freeifaddrs(struct ifaddrs *ifp) {
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* @see tool/viz/getifaddrs.c for example code
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*/
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int getifaddrs(struct ifaddrs **out_ifpp) {
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// printf("%d\n", sizeof(struct ifreq));
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int rc = -1;
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int fd;
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if ((fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0)) != -1) {
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@ -65,42 +153,88 @@ int getifaddrs(struct ifaddrs **out_ifpp) {
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conf.ifc_buf = data;
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conf.ifc_len = size;
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if (!ioctl(fd, SIOCGIFCONF, &conf)) {
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if (IsLinux()) {
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struct ifconf confl6;
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confl6.ifc_buf = data + conf.ifc_len;
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confl6.ifc_len = size - conf.ifc_len;
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if ((rc = getifaddrs_linux_ip6(&confl6)))
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return rc;
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conf.ifc_len += confl6.ifc_len;
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}
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struct ifaddrs *res = 0;
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for (struct ifreq *ifr = (struct ifreq *)data;
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(char *)ifr < data + conf.ifc_len; ++ifr) {
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if (ifr->ifr_addr.sa_family != AF_INET) {
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continue; // TODO(jart): IPv6 support
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}
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struct IfAddr *addr;
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if ((addr = calloc(1, sizeof(struct IfAddr)))) {
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memcpy(addr->name, ifr->ifr_name, IFNAMSIZ);
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addr->ifaddrs.ifa_name = addr->name;
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memcpy(&addr->addr, &ifr->ifr_addr, sizeof(struct sockaddr_in));
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addr->ifaddrs.ifa_addr = (struct sockaddr *)&addr->addr;
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addr->ifaddrs.ifa_netmask = (struct sockaddr *)&addr->netmask;
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if (!ioctl(fd, SIOCGIFFLAGS, ifr)) {
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addr->ifaddrs.ifa_flags = ifr->ifr_flags;
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uint16_t family = ifr->ifr_addr.sa_family;
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if (family == AF_INET) {
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struct IfAddr *addr;
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if ((addr = calloc(1, sizeof(struct IfAddr)))) {
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memcpy(addr->name, ifr->ifr_name, IFNAMSIZ);
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addr->ifaddrs.ifa_name = addr->name;
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memcpy(&addr->addr, &ifr->ifr_addr, sizeof(struct sockaddr_in));
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addr->ifaddrs.ifa_addr = (struct sockaddr *)&addr->addr;
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addr->ifaddrs.ifa_netmask = (struct sockaddr *)&addr->netmask;
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if (!ioctl(fd, SIOCGIFFLAGS, ifr)) {
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addr->ifaddrs.ifa_flags = ifr->ifr_flags;
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}
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if (!ioctl(fd, SIOCGIFNETMASK, ifr)) {
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memcpy(&addr->netmask, &ifr->ifr_addr,
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sizeof(struct sockaddr_in));
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}
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unsigned long op;
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if (addr->ifaddrs.ifa_flags & IFF_BROADCAST) {
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op = SIOCGIFBRDADDR;
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} else if (addr->ifaddrs.ifa_flags & IFF_POINTOPOINT) {
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op = SIOCGIFDSTADDR;
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} else {
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op = 0;
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}
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if (op && !ioctl(fd, op, ifr)) {
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memcpy(&addr->bstaddr, &ifr->ifr_addr,
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sizeof(struct sockaddr_in));
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addr->ifaddrs.ifa_broadaddr = // is union'd w/ ifu_dstaddr
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(struct sockaddr *)&addr->bstaddr;
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}
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addr->ifaddrs.ifa_next = res;
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res = (struct ifaddrs *)addr;
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}
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if (!ioctl(fd, SIOCGIFNETMASK, ifr)) {
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memcpy(&addr->netmask, &ifr->ifr_addr,
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sizeof(struct sockaddr_in));
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} else if (family == AF_INET6) {
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struct IfAddr6 *addr6;
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if ((addr6 = calloc(1, sizeof(struct IfAddr6)))) {
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addr6->ifaddrs.ifa_name = addr6->name;
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addr6->ifaddrs.ifa_addr = (struct sockaddr *)&addr6->addr;
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addr6->ifaddrs.ifa_netmask = (struct sockaddr *)&addr6->netmask;
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addr6->ifaddrs.ifa_broadaddr = (struct sockaddr *)&addr6->bstaddr;
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addr6->ifaddrs.ifa_data = (void *)&addr6->info;
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memcpy(&addr6->name, &ifr->ifr_name, IFNAMSIZ);
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addr6->info.addr_flags = ifr->ifr6_flags;
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addr6->info.addr_scope = ifr->ifr6_scope;
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addr6->addr.sin6_family = AF_INET6;
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addr6->addr.sin6_port = 0;
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addr6->addr.sin6_flowinfo = 0;
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addr6->addr.sin6_scope_id = ifr->ifr6_ifindex;
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memcpy(&addr6->addr.sin6_addr, &ifr->ifr6_addr,
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sizeof(struct in6_addr));
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addr6->netmask.sin6_family = AF_INET6;
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addr6->netmask.sin6_port = 0;
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addr6->netmask.sin6_flowinfo = 0;
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addr6->addr.sin6_scope_id = ifr->ifr6_ifindex;
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memcpy(&addr6->netmask.sin6_addr, &ifr->ifr6_addr,
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sizeof(struct in6_addr));
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*((uint128_t *)&(addr6->netmask.sin6_addr)) &=
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(UINT128_MAX >> ifr->ifr6_prefixlen);
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if (!ioctl(fd, SIOCGIFFLAGS, ifr)) {
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addr6->ifaddrs.ifa_flags = ifr->ifr_flags;
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}
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bzero(&addr6->bstaddr, sizeof(struct sockaddr_in6));
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addr6->ifaddrs.ifa_next = res;
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res = (struct ifaddrs *)addr6;
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}
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unsigned long op;
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if (addr->ifaddrs.ifa_flags & IFF_BROADCAST) {
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op = SIOCGIFBRDADDR;
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} else if (addr->ifaddrs.ifa_flags & IFF_POINTOPOINT) {
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op = SIOCGIFDSTADDR;
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} else {
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op = 0;
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}
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if (op && !ioctl(fd, op, ifr)) {
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memcpy(&addr->bstaddr, &ifr->ifr_addr,
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sizeof(struct sockaddr_in));
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addr->ifaddrs.ifa_broadaddr = // is union'd w/ ifu_dstaddr
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(struct sockaddr *)&addr->bstaddr;
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}
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addr->ifaddrs.ifa_next = res;
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res = (struct ifaddrs *)addr;
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}
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}
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*out_ifpp = res;
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@ -1,6 +1,7 @@
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#ifndef COSMOPOLITAN_LIBC_SOCK_STRUCT_IFREQ_H_
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#define COSMOPOLITAN_LIBC_SOCK_STRUCT_IFREQ_H_
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/sock/struct/sockaddr6.h"
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COSMOPOLITAN_C_START_
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#define IF_NAMESIZE 16
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@ -11,6 +12,14 @@ struct ifreq {
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char ifrn_name[IFNAMSIZ]; /* Interface name, e.g. "en0". */
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} ifr_ifrn;
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union {
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struct {
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uint16_t sa_family;
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uint16_t ifr6_ifindex; /* Interface index */
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uint16_t ifr6_flags; /* Flags */
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uint8_t ifr6_scope; /* Addr scope */
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uint8_t ifr6_prefixlen; /* Prefix length */
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struct in6_addr ifr6_addr;
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} in6;
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struct sockaddr ifru_addr; /* SIOCGIFADDR */
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struct sockaddr ifru_dstaddr; /* SIOCGIFDSTADDR */
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struct sockaddr ifru_netmask; /* SIOCGIFNETMASK */
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@ -29,5 +38,11 @@ struct ifreq {
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#define ifr_flags ifr_ifru.ifru_flags /* flags */
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#define ifr_ifindex ifr_ifru.ifru_ivalue
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#define ifr6_addr ifr_ifru.in6.ifr6_addr /* IP6 Addr */
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#define ifr6_scope ifr_ifru.in6.ifr6_scope /* IP6 Addr scope */
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#define ifr6_prefixlen ifr_ifru.in6.ifr6_prefixlen /* IP6 Prefix length */
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#define ifr6_ifindex ifr_ifru.in6.ifr6_ifindex /* IP6 If index */
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#define ifr6_flags ifr_ifru.in6.ifr6_flags /* IP6 If flags */
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_SOCK_STRUCT_IFREQ_H_ */
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@ -33,7 +33,7 @@
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eth0
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addr: 10.10.10.237
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netmask: 255.255.255.0
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broadcast: 255.255.255.0
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broadcast: 10.10.10.255
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flags: IFF_UP IFF_BROADCAST IFF_MULTICAST IFF_RUNNING
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lo
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@ -74,13 +74,87 @@ int main(int argc, char *argv[]) {
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tinyprint(1, "netmask: ", buf, "\n", NULL);
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}
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if ((ifa->ifa_flags & IFF_BROADCAST) &&
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sockaddr2str(ifa->ifa_netmask, buf, sizeof(buf))) {
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sockaddr2str(ifa->ifa_broadaddr, buf, sizeof(buf))) {
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tinyprint(1, "broadcast: ", buf, "\n", NULL);
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} else if ((ifa->ifa_flags & IFF_POINTOPOINT) &&
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sockaddr2str(ifa->ifa_dstaddr, buf, sizeof(buf))) {
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tinyprint(1, "dstaddr: ", buf, "\n", NULL);
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}
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if (ifa->ifa_addr->sa_family == AF_INET6) {
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int scope = ((int *)ifa->ifa_data)[0];
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int aflags = ((int *)ifa->ifa_data)[1];
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// #define IPV6_ADDR_LOOPBACK 0x0010U
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// #define IPV6_ADDR_LINKLOCAL 0x0020U
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// #define IPV6_ADDR_SITELOCAL 0x0040U
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// #define IFA_F_TEMPORARY 0x01
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// #define IFA_F_NODAD 0x02
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// #define IFA_F_OPTIMISTIC 0x04
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// #define IFA_F_DADFAILED 0x08
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// #define IFA_F_HOMEADDRESS 0x10
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// #define IFA_F_DEPRECATED 0x20
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// #define IFA_F_TENTATIVE 0x40
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// #define IFA_F_PERMANENT 0x80
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// #define IFA_F_MANAGETEMPADDR 0x100
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// #define IFA_F_NOPREFIXROUTE 0x200
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// #define IFA_F_MCAUTOJOIN 0x400
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// #define IFA_F_STABLE_PRIVACY 0x800
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tinyprint(1, "scope:", NULL);
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if (scope == 0x10) {
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tinyprint(1, " loopback", NULL);
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}
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if (scope == 0x20) {
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tinyprint(1, " linklocal", NULL);
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}
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if (scope == 0x40) {
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tinyprint(1, " sitelocal", NULL);
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}
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if (scope == 0x00) {
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tinyprint(1, " global", NULL);
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}
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tinyprint(1, "\n", NULL);
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tinyprint(1, "addr flags:", NULL);
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if (aflags & 0x01) {
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tinyprint(1, " temporary", NULL);
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}
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if (aflags & 0x02) {
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tinyprint(1, " nodad", NULL);
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}
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if (aflags & 0x04) {
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tinyprint(1, " optimistic", NULL);
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}
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if (aflags & 0x08) {
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tinyprint(1, " dadfailed", NULL);
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}
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if (aflags & 0x10) {
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tinyprint(1, " homeaddress", NULL);
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}
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if (aflags & 0x20) {
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tinyprint(1, " deprecated", NULL);
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}
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if (aflags & 0x40) {
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tinyprint(1, " tentative", NULL);
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}
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if (aflags & 0x80) {
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tinyprint(1, " permanent", NULL);
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}
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if (aflags & 0x100) {
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tinyprint(1, " managetempaddr", NULL);
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}
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if (aflags & 0x200) {
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tinyprint(1, " noprefixroute", NULL);
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}
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if (aflags & 0x400) {
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tinyprint(1, " mcautojoin", NULL);
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}
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if (aflags & 0x800) {
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tinyprint(1, " stable_privacy", NULL);
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}
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tinyprint(1, "\n", NULL);
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}
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tinyprint(1, "flags:", NULL);
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if (ifa->ifa_flags & IFF_UP) {
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tinyprint(1, " IFF_UP", NULL);
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